Chapter 2 - Classical Encryption Techniques

American Cryptogram Association: An association of amateur cryptographers. The Web site includes information and links to sites concerned with classical cryptography.Crypto Corner: Simon Singh's Website. Lots of good information, plus interactive tools for learning about cryptography.Solitaire Encryption Algorithm: Developed by Bruce Schneier. This is perhaps the most secure encryption algorithm that can be implemented without a computer.Steganography: Good collection of links and documents.

Chapter 3 - Block Ciphers

Chapter 4 - Finite Fields

PascGalois Project: Contains a clever set of examples and projects to aid in giving students a visual understanding of key concepts in abstract algebra.Finite Fields: A useful reference document by Timothy Murphy of University of Dublin.

Chapter 5 - Advanced Encryption Standard

AES Home Page: NIST's page on AES. Contains the standard plus a number of other relevant documentsAES Lounge: Contains a comprehensive bibliography of documents and papers on AES, with access to electronic copies.

Chapter 7 - Confidentiality Using Symmetric Encryption

NIST Random Number Generation Technical Working Group: Contains documents and tests developed by NIST that related to PRNGs for cryptographic applications. Also has useful set of links.LavaRnd: LavaRnd is an open source project that uses a chaotic source to generate truly random numbers. The site also has background information on random numbers in general.A Million Random Digits: You'll never know when you're going to need some.

Chapter 18 - Intruders

CERT Coordination Center: The organization that grew from the computer emergency response team formed by the Defense Advanced Research Projects Agency. Site provides good information on Internet security threats, vulnerabilities, and attack statistics.Honeynet Project: A research project studying the techniques of predatory hackers and developing honeypot productsHoneypots: A good collection of research papers and technical articles.Intrusion Detection Working Group: Includes all of the documents generated by this group.

Chapter 19 - Malicious Software

Anti-Virus Online: IBM's site on virus information; one of the best.Vmyths: Dedicated to exposing virus hoaxes and dispelling misconceptions about real viruses.